Barium tungsten cathodes are sensitive to electric field strength. Barium tungsten cathode is an electron emission material, and its emission performance is closely related to the surrounding electric field strength. The following are some notes on the sensitivity of barium tungsten cathodes to electric field strength:
Field emission mechanism: The electron emission of the barium tungsten cathode is realized through the field emission mechanism. This means that a sufficient electric field needs to be applied across the cathode surface to overcome the potential barrier for electrons to escape from the cathode surface.
Emission current density: An increase in electric field strength will lead to an increase in the number of electrons emitted from the surface of the barium tungsten cathode, thereby increasing the emission current density.
Non-uniform electric field: If the electric field is non-uniform on the surface of the barium tungsten cathode, the electron emission performance of different regions may be different. Regions with stronger electric fields may have higher electron emission.
Electron Beam Steering: In some applications, the electron beam emitted from a barium tungsten cathode can be controlled by adjusting the strength of the surrounding electric field. By changing the electric field strength, the emission current density and direction can be tuned.
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